Comp. ratio for a 347 w/ Kenne Bell

[BlueSaph95GT]

What kind of compression ratio would best benefit a 347 with a kenne bell blower? We're talking Boss block-based project here...no stock block; mild boost (no more than 10 lbs max) - pump gas and streetable stroker/blower 347 combo. Ideas? I'm dreaming again and wishing for more torque in my SN95...

 

[BlackPearl955.0]

I would like an answer to this as well as this will be my goal

 

[Redsnk95]

If you are going to keep the boost low then I would opt for 9.5 or 10.0:1 compression if doing a custom piston.

 

[95snoozer]

what KB, remember the Kb uses a gt40 which will need to be heavily ported for yoru application.

You should go turbo for monster torque.

 

[BlackVert]

probably something around 9.0:1 or so.

boost is much happier with low compression numbers.

 

[BlueSaph95GT]

http://store.summitracing.com/egnse...k+flow+piston&searchinresults=false&N=700+115

anyone have an idea of which of these pistons might create a 8.5:1 or 9.0:1 ratio??? 8.2 deck/347 with ported TW heads...

 

[juiced_94gt]

Im sorry to hijack but would a 331 with flat top CHP pistons and 61cc AFR 185's live under very low boost with a procharger (6lbs.)??? I really just want a slight bump in power and the WHISTLE I know I know I should have bought dished pistons but I didn't think of it till recently, and it will be custom tuned for sure.

 

[DDSTANG94]

Im sorry to hijack but would a 331 with flat top CHP pistons and 61cc AFR 185's live under very low boost with a procharger (6lbs.)??? I really just want a slight bump in power and the WHISTLE I know I know I should have bought dished pistons but I didn't think of it till recently, and it will be custom tuned for sure.

6 lbs isnt much, but isnt a "slight bump" neither..lol

 

[BlackVert]

juiced, what is your compression ratio?

i am thinking about parchisi, who put a some low boost on his 408 that had 11:1 compression and he broke a piston.

feel like breaking a piston? i'd stay away from boost unless your compression ratio is under 9.5:1

 

[parchisi]

If you decide you want to do it just be really conservative with a higher compression ratio. I was only hitting about 8 lb of boost with my procharger.

And also I'm at 10:1, but its still on the high side.

 

[BlackVert]

... also I'm at 10:1, but its still on the high side.

oops , sorry, i don't know why i thought it was 11:1